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Actually it's pure physics. If you push one speaker in carefully in a unit that has no power connected, the other will pop out nearly the same amount. It's an air-tight enclosure where the bass woofers are the only moving parts connecting the inside of the case to the surrounding air.
This also means, if one bass moves, e.g. from my sample that plays a frequency just on one side, the other base is passively moving along with that. And thereby causing sound, even though it is not driven by anything but the vacuum and pressure generated by the bass on the other side. That makes it impossible to check both speakers separately unless the case with its air-tight seal is opened.
A "mono" bass where both channels are exactly in phase might cancel itself out because both speakers try to push simultaneously out which creates a stronger internal vacuum, and pull in simultaneously creates the respective amount of pressure. This makes bass movement considerably hard. That's where they do some DSP trickery, I think. Putting the bass just a little out of phase on one side might resolve this for good, without a noticeable effect on what your ears perceive.
All this might be completely wrong but if it isn't, it makes the Boom a true engineering marvel.

Actually it's pure physics. If you push one speaker in carefully in a unit that has no power connected, the other will pop out nearly the same amount. It's an air-tight enclosure where the bass woofers are the only moving parts connecting the inside of the case to the surrounding air.
This also means, if one bass moves, e.g. from my sample that plays a frequency just on one side, the other base is passively moving along with that. And thereby causing sound, even though it is not driven by anything but the vacuum and pressure generated by the bass on the other side. That makes it impossible to check both speakers separately as long as the case with its air-tight seal is opened.
A "mono" bass where both channels are exactly in phase might cancel itself out because both speakers try to push simultaneously out which creates a stronger internal vacuum, and pull in simultaneously creates the respective amount of pressure. This makes bass movement considerably hard. That's where they do some DSP trickery, I think. Putting the bass just a little out of phase on one side might resolve this for good, without a noticeable effect on what your ears perceive.
All this might be completely wrong but if it isn't, it makes the Boom a true engineering marvel.

I've seen this before, which is why I wouldn't be surprised if they push the low frequencies into mono and drive both speakers with it. The point of the DSP design is to maximise low frequency output and in a box this small no-one is ever going to get a sense of stereo separation below about 100hz.